煤系中关键金属矿产成矿元素富集的地球化学行为与机制研究对新型矿床的研发和国家关键金属安全供给具有重要作用。项目以煤系中三个不同类型的关键金属矿床为研究对象（煤型镓铝矿床、铌-锆-稀土-镓矿床、锗矿床），以煤中关键金属富集层位的确定为出发点，以查明关键金属赋存状态为技术关键，深入研究关键金属富集过程中的地球化学行为及其机制。拟解决两个关键问题：关键金属的地球化学行为对其赋存状态影响机制，主控地质因素与关键金属元素地球化学行为的耦合机理。项目拟取得两方面创新：揭示不同属性煤盆地中关键成矿元素富集的地球化学行为特征及其机理，查明成矿元素地球化学行为与成煤演化的内在联系与机制。该项目中关键科学问题的解决，对揭示蚀源区以及区域地质演化、对研究有机质和无机质相互作用、对发展和完善已有的关键金属成矿理论具有重要的意义，同时对充分合理利用煤炭资源和控制由燃煤造成的环境污染具有重要的现实意义。

It is very important for research and development of new ore deposits and the national safe supply of critical metals to investigate geochemical behavior its mechanism of critical elements in coal bearing strata. Three different typical types of coal-hosted critical metals will be selected for this project, i.e., coal-hosted Ga-Al, Nb-Zr-REE-Ga, and Ge deposits). The determination of critical-metal enrichment horizons is the basis of this project and the investigation of the modes of occurrence of critical elements is the key technology of the project. The geochemical behavior of critical elements and their mechanism will be in-depth investigated. Two scientific questions, i.e., the influence of geochemical behavior of critical metals on their modes of occurrence, and the coupling mechanism between the geological factors and geochemical behaviors, will be revealed. The project is expected to have two creative points: The driving mechanism for the elvolutin of geochemical behaviors of critical elements in different coal basins, and the relationship between geochemical behavior of critical metals and the coal formation process. The resolution of the scientific questions in this project will be useful to reveal the terrigenous region and reginal geologic evolution, to research the interactions between organic and inorganic matter, and to develop and improve the existing theory of ore formation of critical metal. Also this project will be helpful to fully and reasonably to use coal resources and to effectively control the environmental pollution caused by coal combustion.